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            <div><h3 class="title">
                <a name="asio.reference.InternetProtocol"></a><a class="link" href="InternetProtocol.html"
                                                                 title="Internet protocol requirements">Internet
                protocol requirements</a>
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    <p>
        A type <code class="computeroutput"><span class="identifier">X</span></code> meets the <code
            class="computeroutput"><span class="identifier">InternetProtocol</span></code> requirements if it satisfies
        the requirements of <a class="link" href="AcceptableProtocol.html"
                               title="Acceptable protocol requirements"><code class="computeroutput"><span
            class="identifier">AcceptableProtocol</span></code></a>, as well as the
        additional requirements listed below.
    </p>
    <p>
        In the table below, <code class="computeroutput"><span class="identifier">a</span></code> denotes
        a (possibly const) value of type <code class="computeroutput"><span class="identifier">X</span></code>,
        and <code class="computeroutput"><span class="identifier">b</span></code> denotes a (possibly
        const) value of type <code class="computeroutput"><span class="identifier">X</span></code>.
    </p>
    <div class="table">
        <a name="asio.reference.InternetProtocol.t0"></a>
        <p class="title"><b>Table 21. InternetProtocol requirements</b></p>
        <div class="table-contents">
            <table class="table" summary="InternetProtocol requirements">
                <colgroup>
                    <col>
                    <col>
                    <col>
                </colgroup>
                <thead>
                <tr>
                    <th>
                        <p>
                            expression
                        </p>
                    </th>
                    <th>
                        <p>
                            return type
                        </p>
                    </th>
                    <th>
                        <p>
                            assertion/note<br> pre/post-conditions
                        </p>
                    </th>
                </tr>
                </thead>
                <tbody>
                <tr>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">X</span><span
                                    class="special">::</span><span class="identifier">resolver</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">ip</span><span
                                    class="special">::</span><span class="identifier">basic_resolver</span><span
                                    class="special">&lt;</span><span class="identifier">X</span><span class="special">&gt;</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            The type of a resolver for the protocol.
                        </p>
                    </td>
                </tr>
                <tr>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">X</span><span
                                    class="special">::</span><span class="identifier">v4</span><span
                                    class="special">()</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">X</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            Returns an object representing the IP version 4 protocol.
                        </p>
                    </td>
                </tr>
                <tr>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">X</span><span
                                    class="special">::</span><span class="identifier">v6</span><span
                                    class="special">()</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">X</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            Returns an object representing the IP version 6 protocol.
                        </p>
                    </td>
                </tr>
                <tr>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">a</span> <span
                                    class="special">==</span>
                                <span class="identifier">b</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            convertible to <code class="computeroutput"><span class="keyword">bool</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            Returns <code class="computeroutput"><span class="keyword">true</span></code> if <code
                                class="computeroutput"><span class="identifier">a</span></code> and <code
                                class="computeroutput"><span class="identifier">b</span></code>
                            represent the same IP protocol version, otherwise <code class="computeroutput"><span
                                class="keyword">false</span></code>.
                        </p>
                    </td>
                </tr>
                <tr>
                    <td>
                        <p>
                            <code class="computeroutput"><span class="identifier">a</span> <span
                                    class="special">!=</span>
                                <span class="identifier">b</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            convertible to <code class="computeroutput"><span class="keyword">bool</span></code>
                        </p>
                    </td>
                    <td>
                        <p>
                            Returns <code class="computeroutput"><span class="special">!(</span><span
                                class="identifier">a</span>
                            <span class="special">==</span> <span class="identifier">b</span><span
                                    class="special">)</span></code>.
                        </p>
                    </td>
                </tr>
                </tbody>
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